Boring type mining machine having three boring heads



Dec. 31, 1957 L. D. HAGENBOOK 2,

BORING TYPE MINING MACHINE HAVING THREE BORING HEADS Filed Oct. 18, 1955 3 Sheets-Sheet 1 Fig. 1-

INVENTOR Loy D. Hagenbook 4?. vwz&q- M

TORNEY Dec. 31, 1957 D. HAGENBOOK 2,818,241

' BORING TYPE MINING MACHINE HAVING THREE BORING HEADS BY Loy D. Hagenbook ATTORNEY Dec. 31, 1957 L. D. HAGENBOOK BORING TYPE MINING MACHINE HAVING THREE BORING HEADS Filed Oct. 18, 1955 3 Sheets-Sheet 3 INVENTOR.

ATTORNEY United es Patent BORING TYPE MINING MACHINE HAVING THREE BORING HEADS Loy D. Hagenbook, Chicago, Ill., assignor to Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Application October 18, 1955, Serial No. 541,137

2 Claims. (Cl. 2627) This invention relates to improvements in mining machines of the boring type, employing a pair of laterally spaced rotary boring heads and an intermediate boring head having cutter means in laterally overlapping relation with the cutting means of the first named pair of boring heads for cutting out material therebetween.

The principal object of the invention is to provide an improved form and arrangement of boring heads for the machines of the character mentioned, especially adapted for relatively wide, low-height machines.

It has heretofore been proposed to provide a mining machine with a series of three boring heads having substantially the same general arrangement mentioned above, but the machine of the present invention differs therefrom mainly in the provision of an intermediate boring head having cutter arms of substantially different lengths, and arranged for rotation in such a manner as to eliminate any interference between the cutter arms of the several boring heads, and to produce a more eflicient operation of machines of this character.

The invention may best be understood by reference to the accompanying drawings, in which:

Figure 1 is a side view of a mining machine of the boring type embodying the invention, and showing the machine in operating position at a mine face;

Figure 2 is an enlarged front view of the machine, and

Figures 3 to 6 are diagrammatic front views showing the boring arm in four successive operating positions.

Referring now to details of the embodiment of the invention illustrated in the drawings, 10 indicates generally a mining machine which may be conventional form, including a mobile main frame 11, having endless tractor treads 11a, and an auxiliary tiltable auxiliary frame 12 at the front end of the machine on which the cutting elements are mounted. The cutting elements include a pair of laterally spaced rotary main boring heads 13, 13 and upper and lower chain-carrying cutter bars indicated at 14, 15 for removing the depending and upstanding cusps left between the main boring heads 13. These cutter bars are disposed rearwardly of, but substantially in tangential relation to the main boring heads 13. Each of the boring heads 13 may as usual have a pair of radial arms 16, 16 with forwardly projecting cutter supports 17, 17 at opposite ends thereof, and a second pair of shorter intermediate arms 18, 18 at right angles to the two arms 16 and with forwardly projecting cutter supports 19, 19 thereon. Each of the boring heads 13 also have a coaxial burster cone 20 projecting forwardly therefrom. The general structure of the mining machine and its cutting elements so far described is more or less of conventional form and arrangement and heretofore well known in the art, so need not be further described.

Referring now more particularly to the novel features of the present invention, it will be observed from Figure 2 that the two main boring heads 13 are spaced a considerable distance apart, and that an intermediate boring head l ce 2 21 is disposed with its axis midway between and slightly above the axis of the main boring heads.

The intermediate boring head 21 has a longer arm 22, with a forwardly projecting cutter support 23 at its outer end, and an aligned shorter arm 24 with a forwardly projecting cutter support 25 at its end. Said intermediate head may also have an axially disposed burster cone 26.

The longer arm 22 is of such length as to describe a circularpath partially overlapping the circular paths of the two main boring heads 13, and projecting upwardly to substantially the same horizontal plane as the upper limit of movement of said main boring heads, as indicated in dot and dash lines in Figure 2. It will also be observed that the lower limit of movement of the longer arm is substantially above the mine floor, as the lower cutter bar 15 so as to facilitate loading of loose material into the unobstructed open throat 27 of the central elevating conveyor 28, of the machine, which is more or less conventional in machines of this type.

The longer arm 22 of the intermediate head 21 may also have a core-removing roller 29 of more or less conventional form mounted intermediate its ends. (See Figure 2).

The main boring heads 13, 13 are power driven at the same speed, but in opposite directions, as usual, through suitable gearing (not shown) in the auxiliary frame 12, so as to tend to sweep the cuttings downwardly and inwardly from their bores toward the throat 27 of the elevating conveyor 28. The intermediate boring head 21 may be driven by suitable gearing in either direction; as for instance, clockwise as shown in Figures 3 to 6, but at twice the speed of rotation as the two main heads 13, 13. The relative rotation of the three heads is illustrated diagrammatically in the last named figures, wherein it will be noted that the longer arm 22, which partly overlaps the path of the main cutter heads 13, is disposed so that it always avoids interference with the arms 16 of said main heads. For instance, assuming that one main head 13 is rotating counter-clockwise with its arms at a vertical position while the other main head is rotating clockwise with its arms at a horizontal position, as in Figure 3, the arms 22 and 24 may at that instant be rotated clockwise with the longer arm 22 of the intermediate head overlapping the path of movement of the main head to its left without interference therewith, while the other short arm 24 of the center head extends toward, but short of the adjacent arm of the main head to its right. When the center head thereafter turned through an angle of as shown in Figure 4, the main heads 13 turn through angles of 45. A further turn of of the center head, as shown in Figure 5, will bring the longer arm to a horizontal position where it overlaps the path of movement of the right hand main head, but in this position the arms of the latter head are vertical, having passed through an angle of 90. It will thus be seen that rotation of the three heads may be continued without interference at any time, even though the three heads are rotating in substantially the same transverse plane, and the longer arm 22 of the center head overlaps the path of movement of both of the main heads once during each revolution of said center head.

Although I have shown and described a certain embodiment of the invention, it will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention, as defined in the appended claims.

I claim:

1. In a mining machine, a mobile frame having a pair of laterally spaced rotary boring heads, each with two opposed radial arms, having forwardly projecting cutter supports at their ends for cutting continuous bores in advanes of the machine," means f'or rotating said first-named 'headswat-equa-l speeds "in" opposite directions a central third rotary boring head disposed intermediate said first named ,pair of heads, and rotatable in substantially the same transve'r'se plane; but onan axis above theaxe's-of said first heads',' "s'a'id thirdheadhaving" long and short ra'diai "arms substantially in alignment,- "the long farm having "le'ssf'cuttin'g diameter; but overlapping the paths bf'movement of the two firstnamed 'boringhead'syand the shorter arm 'beingshbrt of the aths ef-movementef said first namedboring heads; means "forrotating 'said central -'hea'd in {synchronized relatiom'with the' firstnanledh'eads 'so that-the-longe'r 'armis maintaineddn non-interferingangular relation-to the armsof 'said other boring heads, and a horizontal cutter bar disposed rear- "Wardly Ofyfifld in substantially tangential relation to 'the U References Cited in the file of this patent UNITED STATES PATENTS 2,694,562 Snyder et al. Nov. 16, 1954 2,750,175 Cartlidge June 12, 1 956 

